99 hyundi elantra

I think my timing belt broke. I was driving and all of a sudden the engine quit, I had power but it wouldn't run. tried to start it but it only made a whurring sound wouldn't turn over. how do I replace a timing belt? how do I mark the timing before I take it apart? and how can I tell if I messed up my pistons or valves?

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Is fuel getting to the engine? It is possible you have a clogged fuel filter OR a dead fuel pump. To check it, disconnect the fuel line from the injector system at the engine, and have someone "bump" the starter to see if fuel comes out. If it does the pump is working but perhaps not with sufficient pressure to run the engine. Checking that requires special tools, a job for a pro.

Is there ignition spark from the sparkplugs? Try pulling one of the plugs out of the engine, and lay it on the engine block in direct contact with the metal and have someone try to start the engine. If you see a spark jump the gap on the plug, you have spark. If it does work, try each sparkplug, and if there is positive spark on all cylinders it is possible the ignition timing is bad or maladjusted. In this case unless you know what you are doing it is better to have a pro mechanic work on it.

to me it sounds more like the timing belt broke ...most of the time when a car with a timing belt at the age of your car suddenly just quits .....it turns out to be the timing belt...have it checked....btw your engine is a interference type engine which means the when the timing belt breaks it bends the valves...meaning a major repair